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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36c75f8f7100b5396d949f1686904fda12fc7bc5b66760e9458ca7acfa28ceb' 
  AND token = '2eEhunPrhDifoiGex0+XRS2rMihmWSA/yNUHAle7wGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}